Parking brake switch location?

So I just bought a Pioneer P1400DVD head unit, and am trying to find the location for the parking brake switch via the internet prior to installing the head unit (one reason: my trucks not here, man). I know there are ways to bypass the parking brake thing so that the DVD will play without the brake engaged, but I don't want the temptation and it's illegal anyway.

So, does anybody know where the parking brake switch is located on the 03-06 trucks? I get my truck back tomorrow morning and want to work on installing this thing right away!